Flexible Shopping Store eCommerce Platform

Magento is a feature-rich, professional open-source eCommerce
solution that offers merchants complete flexibility and control over the
look, content, and functionality of their online store. Features
includes powerful marketing, merchandising and content management.
Magento is designed for scalability and is backed by an extensive
support network.

online store management system

Zen Cart is an online store management that supports multiple
languages and currencies. It's designed to put the dream of running an
online business within anyone's reach. While many other shopping cart
solutions seem to be complicated programming exercises Zen Cart puts the
needs of merchants and shoppers first.

Easy to use online shop

PrestaShop is a popular, easy to use e-commerce solution for small to
medium-sized online shops. Features include support for 38 languages,
special deals and promotions, cross-selling, affiliate programs. The
open source edition supports payment gateways such as Google checkout,
and PayPal with further payment modules offered commercially.

Online shop

osCommerce provides everything you need to get started in selling
physical and digital goods over the internet, from the Catalog frontend
that is presented to your customers, to the Administration Tool backend
that completely handles your products, customers, orders, and online
store data.